Question

1. two plants are grown using the same light and pots. one plant is given water that has been microwaved and the other plant is given regular tap water. their height is measured after 2 weeks.
2. the blood pressure of a soldier is measured while he is resting. the soldier is then exposed to a stressful environment and his blood pressure is measured again.
3. an apple is cut into slices. half of the slices are sprayed with lemon juice. all slices are stored in a sealed plastic bag. after 4 days, they are observed to see how brown they turned.

11.the respiration rate of a goldfish is measured. the goldfish is then placed in cold water and the respiration rate is measured again.

1. bacteria are grown in a petri dish. one side of the dish is sprayed with an antibiotic. after a week, the number of bacteria colonies are counted on each side.

extension: write your own scenario. identify the independent and dependent variables.
lambo and ferr are traveling a mph. at one point, both cars st the brakes. the distance it take u car to stop is then meas

Explanation:

Step1: Define independent and dependent variables

Independent variable is what is changed in an experiment. Dependent variable is what is measured or observed.

Step2: Analyze each scenario

Scenario 8

• Independent variable: Type of water (microwaved water, tap - water)
• Dependent variable: Plant height

Scenario 9

• Independent variable: Stressful environment (presence or absence)
• Dependent variable: Blood pressure

Scenario 10

• Independent variable: Lemon - juice spraying (sprayed or not sprayed)
• Dependent variable: Degree of browning of apple slices

Scenario 11

• Independent variable: Water temperature (cold water or normal water)
• Dependent variable: Respiration rate of goldfish

Scenario 12

• Independent variable: Presence of antibiotic (sprayed or not sprayed)
• Dependent variable: Number of bacteria colonies

Extension scenario

• Independent variable: Type of car (Lambo, Ferrari)
• Dependent variable: Stopping distance

Answer:

Scenario 8: Independent variable - Type of water; Dependent variable - Plant height
Scenario 9: Independent variable - Stressful environment; Dependent variable - Blood pressure
Scenario 10: Independent variable - Lemon - juice spraying; Dependent variable - Degree of browning of apple slices
Scenario 11: Independent variable - Water temperature; Dependent variable - Respiration rate of goldfish
Scenario 12: Independent variable - Presence of antibiotic; Dependent variable - Number of bacteria colonies
Extension scenario: Independent variable - Type of car; Dependent variable - Stopping distance